Homework Answers
Given that, is sample size (n) = 10000, sample mean 
= 61
and sample standard deviation (s) = 25
Claim is : μ ≥ 66
Therefore, the null and alternative hypotheses are,
H0 : μ ≥ 66
Ha : μ < 66
This hypothesis test is a left-tailed test.
Critical value at significance level of 0.01 is, Zcrit = -2.326
Excel Command : =NORMSINV (0.01) = -2.326
Rejection Region : Reject H0, if z < -2.326
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